/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.servicecomb.serviceregistry.version;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;

public final class VersionRuleUtils {
  private static List<VersionRuleParser> parses = new ArrayList<>();

  private static Map<String, VersionRule> versionRuleCache = new ConcurrentHashMap<>();

  static {
    parses.add(new VersionRuleLatestParser());
    parses.add(new VersionRuleStartFromParser());
    parses.add(new VersionRuleRangeParser());
    parses.add(new VersionRuleFixedParser());
  }

  //1.0
  //1.0.0+
  //1.0.0-2.0.0
  //latest
  public static VersionRule getOrCreate(String strVersionRule) {
    Objects.requireNonNull(strVersionRule);

    return versionRuleCache.computeIfAbsent(strVersionRule, VersionRuleUtils::create);
  }

  public static VersionRule create(String strVersionRule) {
    strVersionRule = strVersionRule.trim();
    for (VersionRuleParser parser : parses) {
      VersionRule versionRule = parser.parse(strVersionRule);
      if (versionRule != null) {
        return versionRule;
      }
    }

    throw new IllegalStateException("never run to here");
  }
}
